VISIBILITY AND WEATHER FORECASTING.1

A conventional approach to nighttime visibility in adverse weather conditions

Analysis of The climatic changes in Kermanshah province based on the five criteria of precipitation, temperature, wind, weather phenomena, and horizontal visibility

Score for exposure factor is the sum of scores for the five criteria of precipitation, temperature, wind, weather phenomena, and horizontal visibility. Hourly data on precipitation, temperature, relative humidity, weather condition codes, and horizontal visibility obtained at 23 synoptic stations in the Province, and from those located in an area within a radius of 100 kilometers from the borde...

Cone Visibility Decomposition Cone Visibility Decomposition Cone Visibility Decomposition Cone Visibility Decomposition Cone Visibility Decomposition Cone Visibility Decomposition

(a) (b) Figure 8: The nal set of directions from that covers G S in thick gray lines. Two views are provided with (a) presents the regular view of Figures 5 to 7 and (b) shows the entire Gauss map. See also Figure 1. (a) (b) Figure 6: The boundary and central silhouettes of G S in thick dark gray lines is projected onto the plane z = 1 in thick light gray lines, in (a). In (b), The convex hull ...

Weather Conditions, Weather Information and Car Crashes

Road traffic safety is the result of a complex interaction of factors, and causes behind road vehicle crashes require different measures to reduce their impacts. This study assesses how strongly the variation in daily winter crash rates associates with weather conditions in Finland. This is done by illustrating trends and spatiotemporal variation in the crash rates, by showing how a GIS applica...

Walking in the visibility complex with applications to visibility polygons and dynamic visibility

We first consider the set of faces of the complex representing rays issued from a given object. We define an order on these faces and show, once the visibility complex is computed, how to visit all of them with no additional data structure in optimal time O(kf ), where kf is the number of faces visited. Then we show how to use this walk to perform a topological sweep of the vertices incident to...